Last night saw the remaining X Factor USA finalists: Carly Rose Sonenclar, Tate Stevens, Fifth Harmony and Emblem 3 take to the stage to perform. However not all the attention was on the finalists as Britney Spears showed off her cleavage in a plunging bright yellow dress.

The judge, who has been showing off her toned figure in a series of stylish outfits whilst appearing on the show, definitely gave everyone an eyeful as she leaned her head towards her microphone to speak.

Britney shows off her cleavage in a bright yellow dress (Splash News)

Whilst Britney gained attention for her choice of attire last night, her fellow judges Demi Lovato and Simon Cowell also got attention as they continued their bickering for the third week in a row.

Having exchanged insults for the past two weeks, Simon showed no signs of slowing down as he criticised the comments Demi gave to talented finalist Carly Rose Sonenclar, who did her best to impress the judges with her rendition of 'Your Song' by Elton John.

After Demi said: "Honestly it was still very predictable, you walked out on stage and it was like 'here we go again.' You sound phenomenal, which is great but it was another slow song. That said it was my favorite song you have performed. I don't care if it was predictable because it was great", Simon asked the star:

"Demi I'm confused you did not like it but it was your favourite? So you did like it? Why didn't you just say that", to which Demi retorted: "He can't hear, he is really old."

But not letting Demi have the last word, Simon then commented: "I am going to ignore my little brat."

As the bickering between Demi and Simon continued (Splash News)

Having criticised the band over the past few weeks, it appeared that last night was the night that Emblem 3 finally impressed Demi. Happy with the band's rendition of 'Baby I Love Your Way', Demi commented:

"Honestly that was the first time since the audition that I felt that is what Emblem3 is, that is what is different about them and that is what makes me love them."